EV-I Access Card
Access Card for Plug-In
Loudspeaker Diagnostics
User Instructions
Tools Required:
Instructions:
1. #2 Phillips Screwdriver 2. Ohm Meter capable of accurate
measurements below 50 ohms
#2
1. If applicable, remove screws holding the security cover, gland nut cover, or NL4 cover in
place.
2. Carefully remove the switch card and set it aside. Plug the Access Card onto the header in
place of the switch card. Note that the Access Card, unlike the switch card, will only fit in
one position centered on the input cup (See Figure 1).
3. Turn on the Ohm Meter and set it to the low ohms (x1) scale. Short the two probes togeth-
er and calibrate the meter to “Zero” (See Figure 2). If your meter does not have this calibra-
tion feature, note the ohms reading. This is the residual internal resistance of the meter,
probes and test leads. You will need to DEDUCT this number from the results you measure
at the Access Card.
The Access Card is a unique feature of the EV-Innovation series loudspeaker families. This
simple plug-in device allows diagnostic access to the transducers and protection circuitry
inside the enclosure WITHOUT requiring any disassembly or disconnections beyond simple
removal and replacement of the plug-in switch card. DCR values described in these instruc-
tions are typical for EV-I series two-way systems (eg: EVF-1122S/64).
Figure 1:
Switch Card Removal / Access Card Install
Figure 2:
Ohm Meter Calibration
Adjust
0.0
<50.0
1. Test the woofer: Place one test lead securely on each of the RED test points on the Access
Card. A properly functioning woofer will read approximately 5.0 ohms DCR, ±0.5 ohm (See
Figure 3). A significantly higher reading indicates an open voice coil, meaning the woofer
must be replaced. A significantly lower reading indicates a voice coil that is shorting, mean-
ing the woofer must be replaced.
2. Test the compression driver: Place one test lead securely on each of the YELLOW test
points on the Access Card. A properly functioning compression driver will read approxi-
mately 4.3 ohms DCR, ±0.5 ohm (See Figure 4). A significantly higher reading indicates an
open voice coil, meaning the compression driver must be replaced. A significantly lower
reading indicates a voice coil that is shorting, meaning the compression driver must be re-
placed.
3. Test the PTP (Power Tracking Protection) network: Place one test lead securely on each of
the GREEN test points on the Access Card. A properly functioning PTP will read no more
than 2 ohms (See Figure 5). If the reading is higher, replace the SK-3 lamps on the cross-
over PCB.
4. Unplug the Access Card and re-install the switch card in exactly the same position it was in
originally. If applicable, Re-attach the security cover, gland nut cover, or NL4 cover.
Figure 3:
EVF/EVH Woofer Test
Figure 4:
EVF/EVH Compression
Driver Test
Figure 5:
EVF/EVH Protection
Network Test
Experienced technicians may perform more
sophisticated tests by connecting specialized test gear in place of the ohm meter.
Note: EVF low-frequency systems have no PTP or compression drivers, and use different woof-
ers. See the chart on page 4 for correct DCR values.
5.0 4.3 1.1
Note the position of the HF shading switch card. The card must be replaced in exactly the
same position as it was originally or system performance will be adversely affected!
EVA components are wired in pairs. Therefore, both woofers will be tested together at the
same time, as will the upper HF compression driver pair and the lower HF compression driver
pair. Each HF compression driver pair has its own PTP network and these are also tested
separately. EVA DCR values are referenced to the black (common) test point (See Figure 6).
To directly access transducer pairs for more sophisticated testing, substitute the (-) input con-
nection on the input terminal block for the black (common) test point on the access card (See
Figure 9). Note: DCR values listed are not valid for this connection.
1. Test the woofers: Place one test lead securely on the RED test point and the other on the
BLACK (common) test point on the Access Card. A properly functioning woofer pair will
read approximately 43.2 ohms DCR, ±1 ohm (See Figure 6). A significantly higher reading
indicates one of the woofers has an open voice coil, meaning the woofer needs to be re-
placed. A significantly lower reading indicates one or both of the woofers has a voice coil
that is shorting, meaning the woofer(s) must be replaced.
2. Test the compression driver pairs: Test the upper compression driver pair by placing one
test lead securely on the UPPER YELLOW test point and the other on the BLACK (com-
mon) test point on the Access Card. A properly functioning compression driver pair will
read approximately 41.6 ohms DCR, ±1 ohm (See Figure 7a). A significantly higher reading
indicates one of the compression drivers has an open voice coil, meaning the compres-
sion driver(s) must be replaced. A significantly lower reading indicates one or both of the
compression driver voice coils are shorting, meaning the compression driver(s) must be
replaced. Test the lower compression driver pair by repeating the above test with the meter
connected to the LOWER YELLOW test point (See Figure 7b).
Figure 6:
EVA Woofer Pair Test
Figure 7a:
EVA Upper Compression
Driver Pair Test
Figure 7b:
EVA Lower Compression
Driver Pair Test
43.2 41.6 41.6
12000 Portland Avenue South, Burnsville, MN 55337
Phone: 952/884-4051, Fax: 952/884-0043
www.electrovoice.com
© Bosch Communications Systems 04/2011
U.S.A. and Canada only. For customer orders, contact Customer Service at:
Europe, Africa, and Middle East only. For customer orders, contact Customer Service at:
Other Internatonal locations. For customer orders, Contact Customer Service at:
For warranty repair or service information, contact the Service Repair department at:
For technical assistance, contact Technical Support at:
Specifications subject to change without notice.
Electro-Voice
Series Model Woofers DCR Value Compression Drivers DCR Value PTP Network DCR Value
EVA
EVA-2082S
(All Coverage Patterns)
(2) 8” [203mm] 43.2 ± 1.0Ω (4) 1.25” [32mm] 41.6 ± 1.0Ω Yes <46.0Ω
EVF
EVF-1122S
(All Coverage Patterns)
(1) 12” [ 305mm] 5.0 ± 0.5Ω (1) 2” [51mm] 4.3 ± 0.5Ω Yes <2.0Ω
EVF-1122D
(All Coverage Patterns)
(1) 12” [ 305mm] 5.0 ± 0.5Ω (1) 3” [76mm] 4.3 ± 0.5Ω Yes <2.0Ω
EVF-1152S
(All Coverage Patterns)
(1) 15” [381mm] 5.0 ± 0.5Ω (1) 2” [51mm] 4.3 ± 0.5Ω Yes <2.0Ω
EVF-1152D
(All Coverage Patterns)
(1) 15” [381mm] 5.0 ± 0.5Ω (1) 3” [76mm] 4.3 ± 0.5Ω Yes <2.0Ω
EVF-1121S (1) 12” [ 305mm] 3.8 ± 0.5Ω None N/A No N/A
EVF-1151S (1) 15” [381mm] 5.4 ± 0.5Ω None N/A No N/A
EVH
EVH-1152S
(All Coverage Patterns)
(1) 15” [381mm] 5.0 ± 0.5Ω (1) 2” [51mm] 4.3 ± 0.5Ω Yes <2.0Ω
EVH-1152D
(All Coverage Patterns)
(1) 15” [381mm] 5.0 ± 0.5Ω (1) 3” [76mm] 4.3 ± 0.5Ω Yes <2.0Ω
3. Test the PTP (Power Tracking Protection) networks: Test the PTP network for the UPPER
compression driver pair by placing one test lead securely on the UPPER GREEN test point
and the other on the BLACK (common) test point on the Access Card. A properly function-
ing PTP will read no more than 46 ohms (See Figure 8a). If the reading is higher, replace
the SK-3 lamps on the crossover PCB. To test the PTP network for the LOWER compres-
sion driver pair, repeat the above test using the LOWER GREEN test point (See Figure 8b).
4. Unplug the Access Card and re-install the HF shading switch card in exactly the same posi-
tion it was in originally. If applicable, re-attach the security cover, gland nut cover, or NL4
cover.
Figure 9:
EVA Direct Access for
Transducer Pairs
Figure 8a:
EVA Upper Protection
Network Test
Figure 8b:
EVA Lower Protection
Network Test
44.7 44.7
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